Spacing device for reinforcing-rods in concrete structures.



W. H. BUR-K.

SPACING DEVICE FOR REINFORCING RODS IN CONCRETE STRUCTURES.

' APPLICATION FILED JAN. 25. 1911'.

1,016,319, Patented Feb.6,1912.

2 SHEETS-SHEET 1.

v W. H. BUR-K.

SRAOING DEVICE FOR RBINFORGING RODS IN CONCRETE STRUCTURES.

APPLICATION FILED JAN.25.1911.

1,016,319 Patented Feb. 6, 1912.

2 SHEETS-SHEET 2.

Witnesses:

UNITED STATES PATENT OFFICE.

WILLIAM H. BURK, OF ST. LOUIS, MISSOURI, ASSIG-NOR TO CORRUGATED BAR COMPANY, OF ST. LOUIS, MISSOURI, A. CORPORATION OF MISSOURI.

SPACING- DEVICE FOR REINFORCIN'G-RODS IN CONCRETE STRUCTURES.

Specification of Letters Patent.

Patented Feb. 6, 1912.

Application filed January 25, 1911. Serial No. 604,686.

To all whom it may concern Be it known that I, WILLI M H. BURK, a citizen of the United States, and a resident of the city of St. Louisand State of Missouri, have invented a new and useful Improvement in Spacing Devices for Reinfdrcing-Rods in Concrete Structures, of which the following is a specification.

My invention relates particularly to improvements in reinforced concrete columns, pipes, tanks or cylinders, but is applicable to any structure in which spiral reinforcement or a plurality of spacedv parallel reinforcing bars is used. I

The object of my invention is to provide a simple and efficacious means. for securing the metal reinforcement in spaced relationship in the forms or molds preparatory to filling in the concrete in the process of erecting reinforced concrete columns and like structures.

Another object is to provide a secure and rigid mechanical connection between reinforcing rods and a metal spacing device.

A further object of my inventionis the production of a spacing device formed from rolled stock of usual shape, such as the ordinary sizes of structural steel and merchant iron, as such stock can be easily and cheaply secured, and I also desire to produce a device which is suitable for transportation without being boxed or crated, and which can be shipped in standard sizes and lengths and cut up at the place of use to 'suit the Work in hand.

Two embodiments of my invention accomplishing these objects are shown in the drawings accompanyingthis application, in which like numerals are used to designate like parts throughout the several views, and in which A Figure 1 is a horizontal section through my spacing device used with a s iral reinforcing bar; Fig. 2 is a partial View partly in section and partly in elevation of the. same; Fig. 3 is a partial side view of my spacing device showing'horizontal bars inserted therein in section; Fig. 4 is a partial side View of my spacing device looking at the edge of the notched flange; Fig. 5 is a section on the line 5-5 in Flg. 3; Fig. 6 is a horizontal section through another form of my spacing 'device used with looped reinforcing rods; and Fig. 7 is a View in side elevation of the-same showing some of the loops in section.

In the formof my invention shown in Figs. 1 to 5, the spacing device comprises a commercial angle-bar 12 provided with notches 13 on the edge. of one of the flanges 22 thereof, into which notches the coils 11 of spiral metal reinforce may be inserted to space the-coils at the proper distances from each other. Two or more spacing devices may be used with each spiral reinforce, as maybe found desirable, to properly space the coils and secure them rigidly in this spaced relationship. The reinforcing member thus made up is ready to be placed as a ,unit'in the form, after which concrete may be placed about it to make up the column or otherstructure desired without liability of the reinforce being distorted or knocked out of place during the placing of the concrete. V a

' Figs. 6 and 7 show a metal reinforcing unit for a square column or other structure, in which separate loops of metal 20 are held in spaced relationship by spacing devices 21 T-shaped in cross section. The object of using angle-bars, Ts, or similar structural shapes is to give lateral stiffness to the spacing device that the assembled structures may not easily be distorted by the accidental bending of the spacing members. Such rolled commercial structural shapes are readily procured in the market and may be shipped -uncrated without danger of being injured.

In order to form a secure connection be tween the spacing device and the metal reinforce with which it is used I have arback to close the open edge of the notch and secure the reinforcetherein. ThiSis done at the place of use either before or after the assembled reinforcing member is placed in the form. Thespaclng members are made up at the factory, away from the place of use, in lengths convenient for shipment, 'tied in bundles, and shipped uncrated. At the place of use they can easily be cut to suitable lengths.

For convenience in shipping the spacing device shown in Figs. 1 to 5, made from angle-bars, the prongs 14 are bent away from the other flange of the angle-bar, so that looking atthe end of the angle-bar the shape-thereof is substantially that of a Z- I bar, as shown in Fig. 5. These bars are ticular form of spacing device thus lends itself very readily to shipment uncrated 7 Without liability of damage to itself, or of inflicting any injury on those handling it.

While I have des'cribedlspecific forms of myspacing device, I do not wish, to be limited thereto, but what I desire to secure and protect by Letters Patent is as follows:

1. A spacing device forstructural mem bers comprising a longitudinal metal strip having a part projecting from one edge thereof at an angle to the plane of the strip and notches in the other edge thereof, and prongs having a length greater than their Width adjacent said notches and projecting from said strip in an opposite direction to the part projecting from the other edge of the strip, the lateral Width of said prongs being not greater than the thickness of the part projecting from the opposite edge ofthe strip.

2. A spacing device for metal reinforce comprising an angle-bar having spaced notches along the edge of a flange and flexible prongs integral with the flange and adjacent the notches, said prongs projecting at an angle to the plane of said flange, and lying in a plane parallel to the other flange and on the side of the first named flange away from the other flange of the anglebar, the length and lateral width of the prongs being not greater than the Width andthickness respectively of the opposite flange, whereby substantially a Z-shape section is formed.

WILLIAM H. BURK.

, Witnesses:

' A. M. HOLCOMBE, M. A. SIIELTON. 

